fix naming

snippets/fibonacci.md

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+### Fibonacci array generator
+
+Create an empty array of the specific length, initializing the first two values (`0` and `1`).
+Use `Array.reduce()` to add values into the array, using the sum of the last two values, except for the first two.
+
+```js
+const fibonacci = n =>
+  Array(n).fill(0).reduce((acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i), []);
+// fibonacci(5) -> [0,1,1,2,3]
+```